(10) What sawest thou?--Some modern commentators explain the Hebrew as meaning, What purpose hadst thou? What didst thou look for? But the old rendering is probably right. Abimelech first denies by indignant questions that he had been guilty of any wrong towards Abraham, and then asks what he had seen in the conduct of himself and people to justify such mistrust of them. Throughout, the king speaks as a man conscious that his citizens so respected the rights of a stranger and of marriage, that Sarah would have been perfectly safe had Abraham openly said that she was his wife.

Verse 10. - And Abimelech said unto Abraham, What sawest thou, - either, What hadst thou in view? (Knobel, Delitzsch, Keil, Murphy, et alii), or, What didst thou see? Didst thou see any of my people taking the wives of strangers and murdering their husbands? (Rosenmüller, 'Speaker's Commentary') - that thou hast done this thing?

20:9-13 See here much to blame, even in the father of the faithful. Mark his distrust of God, his undue care about life, his intent to deceive. He also threw temptation in the way of others, caused affliction to them, exposed himself and Sarah to just rebukes, and yet attempted an excuse. These things are written for our warning, not for us to imitate. Even Abraham hath not whereof to glory. He cannot be justified by his works, but must be indebted for justification, to that righteousness which is upon all and unto all them that believe. We must not condemn all as hypocrites who fall into sin, if they do not continue in it. But let the unhumbled and impenitent take heed that they do not sin on, thinking that grace may abound. Abimelech, being warned of God, takes the warning; and being truly afraid of sin and its consequences, he rose early to pursue the directions given him.And Abimelech said unto Abraham,.... Continuing his discourse with him:

what sawest thou, that thou hast done this thing? he desires to know what he had observed, either in him or his people, that gave him any reason to conclude that they were a lustful people, and would stick at nothing to gratify their lusts, which put him upon taking such a method to secure his life, lest they should kill him for his wife's sake.